/*  
 *  Copyright 2006 Paul Jack.
 *
 *  This file is part of the Dex compiler suite. 
 *  
 *  Dex is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or (at your
 *  option) any later version.
 *  
 *  Dex is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 *  Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
package dex.compiler.model.expression;

import dex.compiler.model.base.Place;


/**
 * A unary operator expression, like <code>~bits</code>.
 */
public class UnaryExpression extends Expression {

	
	/**
	 * The unary operator.
	 */
	private Unary operator;
	
	
	/**
	 * The operand.
	 */
	private Expression operand;

	
	/**
	 * Constructs a new unary operator expression.
	 * 
	 * @param place     the place where the expression originated
	 * @param operator  the unary operator
	 * @param operand      the term to apply that operator to
	 */
	public UnaryExpression(Place place, Unary operator, Expression operand) {
		super(place);
		if (operator == null) {
			throw new IllegalArgumentException("operator may not be null");
		}
		if (operand == null) {
			throw new IllegalArgumentException("operand may not be null");
		}
		this.operator = operator;
		this.operand = operand;
	}


	@Override
	public String toString() {
		return operator.getSymbol() + operand;
	}


	/**
	 * Returns the operand.
	 * 
	 * @return  the operand
	 */
	public Expression getOperand() {
		return operand;
	}
	
	
	/**
	 * Returns the operator.
	 * 
	 * @return  the operator
	 */
	public Unary getOperator() {
		return operator;
	}
}
